Results show Iran's Rouhani winning re-election

Tehran : Iranian President Hassan Rouhani appeared to have secured a convincing election victory with voters backing his efforts to rebuild foreign ties, as initial results were announced on Saturday. 

With almost all votes counted, Rouhani looked to have an insurmountable lead with 22.8 million votes compared to 15.5 million for his hardline challenger Ebrahim Raisi, election committee chief Ali Asghar Ahmadi announced on state television.

A huge turnout on Friday -- estimated at more than 40 million out of 56 million registered voters -- led to the vote being extended by several hours to deal with long queues. 

"I congratulate the great victory of the Iranian nation in creating a huge and memorable epic in the continuation of the path of 'wisdom and hope'," tweeted Vice President Eshaq Jahangiri, referring to the government's slogan.

Rouhani, a 68-year-old moderate cleric who spearheaded a 2015 nuclear deal with world powers, has framed the election as a choice between greater civil liberties and "extremism". 

Hardline cleric Raisi, 56, had positioned himself as a defender of the poor and called for a much tougher line with the West.

But his revolutionary rhetoric and efforts to win over working class voters with promises of increased handouts appear to have gained limited traction. 

"Rouhani's vote, particularly in rural areas, shows that Iranian people no longer believe in economic populism and radical change," said Ali Vaez, Iran analyst for the International Crisis Group, a think tank. 

"They have the maturity to understand that the solution to their country's predicaments are in competent management of the economy and moderation in international relations," Vaez told AFP.

Rouhani's central first-term achievement was a deal with six powers led by the United States that eased crippling economic sanctions in exchange for curbs on Iran's nuclear programme.

He gained a reprieve this week when Washington agreed to continue waiving nuclear-related sanctions, keeping the deal on track for now.